CN102766434B - Compressible sealing material with low permeability for vehicle-mounted tail gas sensor - Google Patents
Compressible sealing material with low permeability for vehicle-mounted tail gas sensor Download PDFInfo
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- CN102766434B CN102766434B CN201210206120.8A CN201210206120A CN102766434B CN 102766434 B CN102766434 B CN 102766434B CN 201210206120 A CN201210206120 A CN 201210206120A CN 102766434 B CN102766434 B CN 102766434B
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- sealing material
- particle
- tail gas
- gas sensor
- sensor
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Abstract
The invention discloses a compressible sealing material with low permeability for a vehicle-mounted tail gas sensor. A formula of the compressible sealing material comprises at least 60% of talcum powder and no more than 25% of a dense inorganic additive with lamellar particle morphology. The inorganic additive with lamellar particle morphology is characterized in that a ratio of a half of a sum of a maximum length and maximum width of the lamellar particle to a maximum thickness of the particle is greater than 3. The sealing material may comprise other components such as a binder, a lubricant or other materials. The inorganic additive has a role of impeding dispersion of volatile gas from an exhaust end to an atmospheric end of the sensor and (or) suction of liquid in the same way. Therefore, the sealing material provided by the invention can significantly impede permeability of gasoline liquid or gasoline volatile gas.
Description
Technical field
The present invention relates to a kind of sealing material, particularly relate to one and there is low-permeability, compressible vehicle mounted tail gas gas sensor sealing material.
Background technology
The sealing member of vehicle mounted tail gas gas sensor prevents tail gas and other pollutent from leaking into the atmosphere end of sensor, and these leakages are major reasons that gas sensor lost efficacy.Will complete sensor seal process when sensor assembles, this process comprises Compressive forces to sealing material, and sealing material be expressed in sensor housing up and down between lining.Force of compression, except compacting sealing material, also forces sealing material lateral spread, thus sealing material is closely pressed to be attached on sensor housing and sensing unit periphery.
Because the mobility of sealing material is very limited, and compression direction is perpendicular to sealing material flow direction, and will apply enough large force of compression under the strict condition controlled, guarantee gas sensor seals well.In any partial area, force of compression can't be excessive, and sensing unit just can not be made to crack or damage.
The main raw material(s) of current vehicle-mounted gas sensor seal is talcum powder, adds some additives, such as low melting glass, boron nitride, inorganic fluoride etc.The object of these additives reduces the perviousness of sealing material, particularly prevents gasoline volatilization gas and gasoline liquid toward the infiltration in sealing material.Although these additives can improve the perviousness of sealing material more or less, use them usually can increase sensor assembly cost and (or) increase the complicacy of assembling process.In addition conveniently, boron nitride also can separately as sealing material.
Summary of the invention
Main purpose of the present invention is to provide the sealing material that can overcome existing sealing material shortcoming, permeates it effectively to hinder liquid or all kinds of volatilization gas.
The low-permeability compressible seal material prescription that the present invention is used for vehicle mounted tail gas gas sensor comprises the talcum powder of at least 60% and the inorganic additives with platelet particle morphology of no more than 25%, and the feature of the inorganic additives of its platelet particle morphology is: the maximum length of platy shaped particle is greater than 5 with the half of maximum width sum and the ratio of particle maximum ga(u)ge.Other composition in sealing material may comprise tackiness agent, lubricant, or other material.
Inorganic additives of the present invention may be silicon carbide, TiB2, mica, or other has the compact inorganic thing of flaky particle structures.
Tackiness agent of the present invention may be polyoxyethylene glycol (Polyethylene glycol).
Lubricant of the present invention may be magnesium stearate (Magnesium stearate).
Other material of the present invention may be low melting glass particle.
The average quite ball-type grain diameter (Equivalent Spherical Diameter) of talcum powder host grain of the present invention is no more than 20 μm.
The average quite ball-type grain diameter (Equivalent Spherical Diameter) of inorganic additives particle of the present invention is no more than 80 μm.
The present invention, owing to having the inorganic additives of platelet particle morphology just as a kind of obstacle, increases the average path length that spreads to atmosphere end from sensor tail gas end of volatilization gas widely, and (or) average path length that sucks from same path of liquid.Gasoline liquid or gasoline volatilization gas can be hindered significantly to permeate it.
embodiment
Below in conjunction with embodiment, the present invention is described in detail.In the following stated, title agreement (simplification) is as follows:
1) percentage is all weight percentage.
2) host grain (primary particle) refers to single crystal (a single crystallite) particle of material, instead of refers to the crystal polymer that produces in processing treatment starting material process.
3) average quite ball-type grain diameter (Equivalent Spherical Diameter) is referred to as median size.
Embodiment 1:
The low-permeability compressible seal material prescription for vehicle mounted tail gas gas sensor described in this enforcement is the talcum powder of 86%, the mica (Mica) with platelet particle morphology of 12%, the polyoxyethylene glycol (Polyethylene glycol) of 1%, the magnesium stearate (Magnesium stearate) of 1%, wherein said talcous host grain median size is approximately 10 μm.The median size of mica is approximately 50 μm.
Embodiment 2:
The low-permeability compressible seal material prescription for vehicle mounted tail gas gas sensor described in this enforcement is the talcum powder of 79%, the mica (Mica) with platelet particle morphology of 20%, the polyoxyethylene glycol (Polyethylene glycol) of 0.5%, the magnesium stearate (Magnesium stearate) of 0.5%, wherein said talcous host grain median size is approximately 10 μm.The median size of mica is approximately 25 μm.
Embodiment 3:
The low-permeability compressible seal material prescription for vehicle mounted tail gas gas sensor described in this enforcement is the talcum powder of 74%, the silicon carbide (Silicon carbide) with platelet particle morphology of 25%, the polyoxyethylene glycol (Polyethylene glycol) of 0.5%, the magnesium stearate (Magnesium stearate) of 0.5%, wherein said talcous host grain median size is approximately 12 μm.The median size of mica is approximately 20 μm.
Embodiment 4:
The low-permeability compressible seal material prescription for vehicle mounted tail gas gas sensor described in this enforcement is the talcum powder of 74%, the TiB2 (Titanium diboride) with platelet particle morphology of 25%, the polyoxyethylene glycol (Polyethylene glycol) of 0.5%, the magnesium stearate (Magnesium stearate) of 0.5%, wherein said talcous host grain median size is approximately 12 μm.The median size of mica is approximately 25 μm.
Embodiment 5:
The low-permeability compressible seal material prescription for vehicle mounted tail gas gas sensor described in this enforcement is the talcum powder of 75%, the mica (Mica) with platelet particle morphology of 10%, with the low melting glass particle of 15%, wherein said talcous host grain median size is approximately 10 μm; The median size of mica is approximately 50 μm; The fusing point of glass particle is between 600 to 750 degrees Celsius.
Embodiment 6:
The low-permeability compressible seal material prescription for vehicle mounted tail gas gas sensor described in this enforcement is the talcum powder of 65%, the mica (Mica) with platelet particle morphology of 20%, with the low melting glass particle of 15%, wherein said talcous host grain median size is approximately 10 μm; The median size of mica is approximately 50 μm; The fusing point of glass particle is between 600 to 750 degrees Celsius.
The preparation of sealing material of the present invention with service routine is: first various starting material completely all with together with, then, grind all with after material, finally become the powder with certain fluidity.Thereafter, sealing powder can be pressed into the prefabricated film in applicable sensor suit space, also when sensor assembles, directly sealing powder can be poured in sensor housing.If be pressed into prefabricated film, sealing powder roasting to sufficiently high temperature, to remove organic impurity wherein and moisture.But maturing temperature can not be too high, in case stop loss the structure of bad talcum powder and other additive, the arrangement also preventing sealing material from producing sintering or material granule changes.After roasting, prefabricated film is loaded above the front end ceramic chamber lining in sensor housing, then, rear end ceramic chamber lining is contained in above prefabricated film, just can carries out pressure seal operation.Thereafter other suit operation of sensor has been gone again.
If directly use sealing powder, first powder is poured in the gap on the ceramic chamber lining of front end, between sensing unit and housing, then puts into rear end ceramic chamber lining, just can carry out pressure seal.Pour into sealing powder and expect that the process of pressure seal also can point multistep be carried out, often step is forced into certain pressure, finally thoroughly completes compression with high pressure again.After compression, sensor housing is withheld on the ceramic chamber lining of rear end.Following step is that work in-process are done pyroprocessing, to remove organic impurity and moisture.Just can carry out the assembling of miscellaneous part afterwards.
No matter be directly use sealing powder, or use prefabricated film to complete sealing, pressure process will force sealing member lateral deformation, flowing exactly, sealing material pressure is attached on sensor housing and sensing unit periphery.Because the mobility of sealing material is very limited, and compression aspect is perpendicular to sealing material flow direction, and will apply enough large pressure under the strict condition controlled, guarantee gas sensor seals well.
In any partial area, force of compression can't be excessive, and sensing unit just can not be made to crack or damage.
There is the inorganic additives of platy shaped particle just as a kind of obstacle in the present invention's formula, hinder volatilization gas from sensor tail gas end to atmosphere end disperse and (or) liquid sucks from same path, also greatly increase pollutent by sealing material simultaneously, arrive the average path length of sensor atmosphere end.
The present invention protects category to be never limited to embodiment
.
Claims (2)
1. the low-permeability compressible seal material for vehicle mounted tail gas gas sensor, be characterised in that: formula comprise at least 60% talcum powder and no more than 25% and be not 0% the inorganic additives with platelet particle morphology, the maximum length of the platy shaped particle of the inorganic additives of its platelet particle morphology is greater than 5 with the half of maximum width sum and the ratio of particle maximum ga(u)ge; The average quite ball-type grain diameter of described talcum powder host grain is no more than 20 μm; The average quite ball-type grain diameter of described inorganic additives particle is no more than 80 μm.
2., as claimed in claim 1 for the low-permeability compressible seal material of vehicle mounted tail gas gas sensor, it is characterized in that: the maximum length of platy shaped particle is greater than 9 with the half of maximum width sum and the ratio of particle maximum ga(u)ge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210206120.8A CN102766434B (en) | 2012-06-21 | 2012-06-21 | Compressible sealing material with low permeability for vehicle-mounted tail gas sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210206120.8A CN102766434B (en) | 2012-06-21 | 2012-06-21 | Compressible sealing material with low permeability for vehicle-mounted tail gas sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102766434A CN102766434A (en) | 2012-11-07 |
| CN102766434B true CN102766434B (en) | 2015-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210206120.8A Expired - Fee Related CN102766434B (en) | 2012-06-21 | 2012-06-21 | Compressible sealing material with low permeability for vehicle-mounted tail gas sensor |
Country Status (1)
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Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6013874A (en) * | 1983-07-01 | 1985-01-24 | Masahiro Kobayashi | Material for gasket |
| GB9107599D0 (en) * | 1991-04-10 | 1991-05-29 | Oxford Polytechnic | Improvements in and relating to sealing compositions |
| JP2510448B2 (en) * | 1991-12-20 | 1996-06-26 | ニチアス株式会社 | Heat resistant seal material |
| JPH0613874A (en) * | 1992-06-24 | 1994-01-21 | Yazaki Corp | Optical driving circuit for optical electrostatic thyristor |
| JP2909806B2 (en) * | 1995-10-20 | 1999-06-23 | ニチアス株式会社 | Manufacturing method of heat resistant molded sealing material |
| CN1092223C (en) * | 1998-06-24 | 2002-10-09 | 陈明伟 | Sealing glue for fuel gas pipeline |
| US6484561B2 (en) * | 2000-12-15 | 2002-11-26 | Delphi Technologies, Inc. | Externally crimped exhaust gas sensor and method for forming an external shield crimp |
| PT1593659E (en) * | 2004-05-04 | 2008-02-14 | Lafarge Platres | Process for making a structure, pointing and surfacing compound for structural elements and process for preparing the same |
| JP4471016B2 (en) * | 2008-04-07 | 2010-06-02 | トヨタ自動車株式会社 | Gas sensor and manufacturing method thereof |
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2012
- 2012-06-21 CN CN201210206120.8A patent/CN102766434B/en not_active Expired - Fee Related
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| CN102766434A (en) | 2012-11-07 |
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